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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Pain. 2015 Feb;156(2):341–347. doi: 10.1097/01.j.pain.0000460315.80981.59

Figure 2.

Figure 2

Correlation between post-operative pain, opioid use, and 2-AG levels. Correlations between 12 and 24 hr NRS pain scores and 2-AG levels in the (A) synovial fluid and (B) CSF. (C) Correlations between synovial fluid 2-AG levels and cumulative post-operative opioid use during the first 12 hrs and 24 hrs after surgery.